The NREMT practical at least for me was done at the end of my EMT-B class and I was tested by my EMT instructors not at a NREMT testing center, I don't know if its done the same everywhere else but that is just for me in Washington state. The NREMT written or CAT(computer adaptive test) is done at a NREMT testing center like pearson vue. Also I don't know if this is the same everywhere else but your required to get a minimum 80% on every exam throughout the class, I assume it is the same because that is also NREMT standards, don't sweat the tests as long as you study the sheets and read the book its easy, the lowest score I got on any one of the practical or written exams in my EMT class was 99%. Although I do remember some people failing them but they must have simply not studied enough as well as a lot of people take the course simply for the credits so they don't get into as much as I did. It was always funny (for me) when we would bring our scan-trons to be graded and the machine would go off like a machine gun for some people.